WASTE: 100% SUCCESS IN TEST ON THE USE OF COMPOSTABLE FOOD WASTE BAGS IN ANAEROBIC DIGESTION PLANTS IN GERMANY
Novara, 3 May 2017 – Novamont commissioned IGlux Witzenhausen GmbH and Witzenhausen-Institut GmbH to conduct a scientific study into the behaviour of compostable food waste bags made from MATER-BI – the bioplastic made by Novamont – in German anaerobic digestion plants.
The use of compostable bags made from MATER-BI was tested in a procedure which encompassed the entire process using equipment made by four different companies: Kompogas, Thoeni, Bekon and WTT.
The bags were monitored during pre-treatment, anaerobic digestion, post-composting and maturation at each plant. The percentage by weight of MATER-BI in the input material was between 3.5% and 3.8%. Degradation began during the anaerobic stage and was completed during composting. In total the process took between five and ten weeks, depending on the plant. No MATER-BI residue was found in any of the samples examined at the end of the test, demonstrating that it had completely degraded in all four plants.
The test was commissioned in Germany, where organic waste plays a significant role in the national renewable energy plan and is increasingly used to produce biogas. Efficient diversion of this type of waste is therefore crucial for recovering the most energy-rich component, namely kitchen waste. At present, however, even where separate collection of organic waste is in place, studies show that a significant percentage of organics is still sent to landfill. This explains an increased use of waste bags made from compostable bioplastics by householders for comfort and hygiene reasons.
The test was entirely successful, with complete degradation of MATER-BI bags within standard processing times at all four facilities, which are representative of the majority of anaerobic digesters processing municipal organic waste in Germany.
Francesca De Sanctis - francesca.desanctis@novamont.com
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